Connecting The Strings To Rapid Shutdown Box - SMA RAPID SHUTDOWN SYSTEM Instrucciones De Instalación

6 Electrical Connection
6.6

Connecting the Strings to Rapid Shutdown Box

Up to four input strings and two output strings can be connected to the Rapid Shutdown Box. In the
Rapid Shutdown Box, two of the four input strings are connected in parallel. The input strings must
be connected to the DC conductors fitted with MC4 connectors that lead from the Rapid Shutdown
Box. The output strings must be connected to the corresponding terminal blocks inside the Rapid
Shutdown Box.
Faulty operation of the inverter due to incorrect connection of the output strings to
the Rapid Shutdown Box
The output strings must lead to the same inverter if two output strings are connected to the
Rapid Shutdown Box. The operation of at least one inverter is interrupted if the two output
strings are connected to different inverters.
• Connect only output strings to the connecting terminal plate A and B which are leading
to the same inverter.
Procedure:
• Connect the output strings.
• Connect the input strings.
Connecting the output strings
Additionally required material:
☐ Conduit (trade size: 21 mm (0.75 in) or smaller with suitable reducer bush)
☐ Raintight or liquidtight conduit fitting (trade size: 21 mm (0.75 in) or smaller with suitable
reducer bush)
Requirements for the conductors:
☐ The conductors must be made of solid wire, stranded wire or fine stranded wire. When using
fine stranded wire, bootlace ferrules must be used.
☐ Conductor cross-section: 4 mm² to 10 mm² (12 AWG to 6 AWG)
Procedure:
1.
Danger to life due to high voltages of the PV array
When exposed to sunlight, the PV array generates dangerous DC voltage which is present in
the DC conductors. Touching the DC conductors can lead to lethal electric shocks.
• Switch off the DC load-break switch on the inverter.
• Only touch the DC conductors on their insulation.
2. Pull off the adhesive tape on the enclosure opening.
3. Attach the conduit at the conduit fitting in the Rapid Shutdown Box enclosure.
4. Lead the positive and negative conductors of the first output string up to the connecting
terminal plate A.
30 RSS-US-IA-xx-13
SMA Solar Technology America LLC
Installation Manual